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13-25-629 v03 Page 37

MISCELLANEOUS CONTROL DEVICES

- Refer to Figure 4-15 for the schematic diagram of the control system.

Intake [Air] Filter (1) -

Captures solid impurities in the air stream entering compressor inlet. It also attenuates

noise emitted by the compressor inlet.

Inlet-Valve Assembly (2) -

This device controls the intake of atmospheric air entering the compressor during the

Load/Unload phases of operation.



During the loaded state: The

inlet poppet (2.2)

remains open and enables atmospheric air to enter the

compressor inlet.



During the unloaded state: The

2-way solenoid valve (Y

) feeds pressurized air underneath the

piston

(2.1)

, forcing it and

the inlet poppet (2.2)

upward and blocking-off the compressor intake. A

small purge

orifice (18)

, located below the poppet, allows a stream of air to reach (e.g., purge) the rotors and keep them

from unstable, noisy operation and producing sufficient pressure to maintain cooling/lubricating oil flow. See
Section 9 for maintenance information.

Electric Motor (3)

–

Drives the

compressor (4)

via a

belt drive assembly (5),

and drives the package

ventilation fan from a secondary rear shaft.

It is energized by the full voltage-type starter (variable speed drive in

1 phase models), which in turn is controlled by the GD Pilot controller.

Oil Sump (6)

–

Separates by inertial effects the bulk of the compressed air and injection oil streams and serves

as a sump for the latter.

Air/oil separator (7) -

Intercepts and coalesces the aerosol oil stream in the compressed air exiting the inertial

separation process within the oil sump.

Oil Filler Cap (8)

–

Oil fill port on the oil sump.

Oil drain (9, 28)

– Ball valve (9) drains the oil from the sump and cap (28) drains the oil trapped in the oil cooler

and associated hoses.

Oil Level Indicator (10) -

This gauge is located on the oil sump and indicates the oil level. See “Oil Level Gauge”

on Section 5 for more details.

Oil Filter (11) -

Captures solid impurities in the oil entering the compressor injection port.

Oil Cooler (12)

–

The air-cooled heat exchanger removes heat from the oil stream prior to injection.

Pressure Relief Valve

(13)

– This device protects the pressure containing components of the compressor

package against high pressure exceeding 217 psig. See Section 9 for maintenance information.

Minimum Discharge Pressure/Check Valve (14) -

This device maintains minimum pressure (70 psig) within the

air/oil sump, thus ensuring adequate lubricating oil injection flow to the compressor even when no air delivery into
the system is taking place. It also functions as a check valve to prevent reversed air flow from the system line
during compressor stoppage. See Section 9 for maintenance information.

Air cooler (15)

–

The air-cooled heat exchanger removes heat from the air stream prior to exit from the package.

Scavenge line orifice and orifice (16)

–

This annular orifice, built into the air/oil separator element adaptor pipe,

controls the amount of oil and compressed air that is returned from the air/oil separator back into the compressor.
A separate check valve (19) prevents the backflow of oil into the air/oil separator element upon unit stoppage.